-=> Quoting Jim Dawson to Tony Paton       01-07-98  09:22 <=-
 JD> The R-3350 turbo-compound engine set records for low fuel consumption
 JD> by using the waste energy in the exhaust. Fuel consumption level were
 JD> close to that of the more efficient diesel engines. This engine of 18
 JD> cylinderrs had three of these blow-down type turbines that extracted
 JD> energy from the exhaust much in the manner of a steam turbine used in
 JD> electrical generating plants. These turbines were coupled to the engine
 JD> crankshaft through a driveshaft and each of the turbines added about
 JD> 120 HP with no additional fuel conusmption. These engines were used on
 JD> not only the DC-7 but the late Constellations and some military
 JD> aircraft. These turbines also muted the engine noise. 
     Hello Jim ..
     I'm not familar with aircraft engines but I worked on some slow
     and medium speed diesel engines aboard ships ..
     About Turbocharging, yes it is used to increase the efficiency
     of the engine, reduce the number/dimentions of a cylinder for a
     given KiloWatts ..
     But the turbochargers I have seen consists of a rotor with Turbine
     blades at one end and compressor wheel at the other end of the Shaft
     the exhaust gases goes through the turbine side and drives the whole
     assembly ..
     the compressor draws, compress and feeds air to the cylinders through
     air coolers ..
     Also just want to know what is the size of these blowers compared to
     the aircraft engines and are they used in commerical aircrafts ..
     Best Regards ..
     Abdulhadi Al-Juhani
... öÄÄÄÄÍÍÍÍÍÍþðäÝ E-Mail : abdulhadi.al-juhani@dari.com ÝäðþÍÍÍÍÍÍÄÄÄÄö
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